如图所示是在仿真器挂起时,通过外部电路驱动对C6748的HPI接口先后进行HPIC和HPIA的写操作的逻辑波形。
HPIC的写操作一切正常。写入的值为0x0001。
随后HCNTL【1:0】变为10b,再接着HCS负跳变,准备进行HPIA的写操作。随即,在HDS还没有使能的情况下,HRDY上跳变。之后除一个短暂的下跳变之外,HRDY一直处于高电平。请问是怎么回事?
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